1. Department of Chemical and Biomolecular Engineering Johns Hopkins University Baltimore Maryland USA
2. Department of Chemistry and Biochemistry University of Maryland College Park Maryland USA
3. Division of Bacterial, Parasitic and Allergenic Products (DBPAP), Laboratory for Bacterial Polysaccharides, Center for Biologics Evaluation and Research US Food and Drug Administration Silver Spring Maryland USA
4. Division of Pediatric Surgery, Department of Surgery Johns Hopkins University Baltimore Maryland USA